fix(config): default OrcaRouter to deepseek-v4.1-flash-1017

The descriptor is what resolver::resolve_scoped falls back to when a
session picks orcarouter with no saved wire model and no catalog row
marked default_for_provider; every OrcaRouter offering in the live
catalog has that flag false, so this JSON value is the only thing
deciding the default route.

Verified: ./scripts/dev-cargo.sh check -p codewhale-config (exit 0, via
the tui+config check) — crates/config/build.rs regenerates the
descriptors from this asset, so the new default is compiled in.
Not verified: a live OrcaRouter turn on the new default model.

config.example.toml

@@ -660,7 +660,7 @@ base_url = "https://api.deepseek.com/beta"
 [providers.orcarouter]
 # api_key = "YOUR_ORCAROUTER_API_KEY"
 # base_url = "https://api.orcarouter.ai/v1"
-# model = "deepseek/deepseek-v4-pro"
+# model = "deepseek/deepseek-v4.1-flash-1017"   # built-in default for this provider
 # Namespaced wire models pass through verbatim (deepseek/deepseek-v4-pro,
 # deepseek/deepseek-v4-flash); OrcaRouter's own auto-routing model is
 # selectable as "orcarouter/auto".

crates/config/assets/provider_descriptors.json

@@ -338,7 +338,7 @@
       "id": "orcarouter",
       "label": "OrcaRouter",
       "base_url": "https://api.orcarouter.ai/v1",
-      "default_model": "deepseek/deepseek-v4-pro",
+      "default_model": "deepseek/deepseek-v4.1-flash-1017",
       "env_vars": [
         "ORCAROUTER_API_KEY"
       ],